Just days after the destruction of New York's Twin Towers, America was again paralysed by fear following the launch of a deadly anthrax attack. This programme looks at the FBI's work to track down the culprits behind a crime that led to the deaths of five people and spread global panic. Although the killer remains free a year on, discoveries by America's best forensic minds give shocking new insights.
Producer Martin Wilson ; Executive Producer Fiona Murch
